A transmission deterministic access method for asynchronous terminals
An access method and asynchronous terminal technology, applied in electrical components, time-division multiplexing systems, multiplexing communications, etc., and can solve problems such as missing transmission time points, terminal devices that do not support 802.1AS, and are not from the same company. , to achieve the effect of eliminating uncertainties
Active Publication Date: 2022-07-01
BEIJING JIAOTONG UNIV
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[0005] However, in practical applications, the provider of network equipment (that is, the TSN switch manufacturer) and the provider of terminal equipment are usually not the same; and for the same application, such as train communication network, vehicle-mounted network, etc., there are many suppliers of terminal equipment. Although TSN has standardized the time synchronization protocol 802.1AS, due to problems such as cost and system transformation, many terminal devices do not support 802.1AS, and these terminal devices access TSN showing asynchrony, that is, asynchronous access of terminal devices
Since they do not participate in time synchronization, they cannot send the data flow according to the precise sending time point of the synchronization. As a result, the data flow may miss its sending time point when it arrives at the first switch. At this time, it is necessary to wait until the next sending time point before sending. As a result, delay jitter of up to one scheduling cycle is caused, which seriously damages the determinism of TSN transmission, which has also become one of the key factors restricting the application and promotion of TSN in the industry.
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[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.
[0037] It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of stated features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps...
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A transmission deterministic access method of an asynchronous terminal provided by the present invention includes two mechanisms, one is an asynchronous to synchronous mechanism, and the other is a delay adaptation mechanism. The packet is sent out at the latest sending time point, and the packet is transmitted to the edge switch in the synchronization domain according to the TSN time-triggered transmission mechanism. The edge switch keeps the packet for a period of time before sending it to the receiving terminal. The delayed sending time is equal to the data The difference between the sending period of the flow and the dwell time of the packet, so as to eliminate the uncertain factor of the end-to-end delay. The method provided by the invention solves the problem of time delay jitter in one scheduling period caused when the data stream of the asynchronous terminal is transmitted in the TSN network, so that the asynchronous terminal that does not participate in time synchronization obtains a deterministic end-to-end time delay.
Description
technical field [0001] The invention relates to the technical field of deterministic real-time transmission of computer networks, in particular to a transmission deterministic access method of asynchronous terminals. Background technique [0002] Time-Sensitive Networking (TSN) was proposed and standardized by the IEEE 802.1TSN Group in 2012. It has become an important research direction for the transformation and upgrading of industrial Internet infrastructure, and is widely accepted by academia and industry. TSN introduces a time-triggered transmission mechanism (Time-triggered Transmission) to schedule the data flow from the sending terminal to the receiving terminal at the sending time point in each device along the routing path, such as figure 1 shown, the data flow f i There are sending time points in each device (including switches and terminals), such as f i in the sending terminal v 0 The time of sending in is The end-to-end delay can be expressed as the sendin...
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IPC IPC(8): H04J3/06
CPCH04J3/0661
Inventor 李宗辉
Owner BEIJING JIAOTONG UNIV